在SQL查询中查找日期之间的名称

Question

我有一张名为Emp的桌子。其中有3列Name，LastWorkingDay，LeaveValue，DateofReturn。我想写一个查询：

• 最后工作日和DateofReturn介于当前整周
之间

我的表格应该返回＆＃39; 2016-10-10＆＃39;和＆＃39; 2016-10-16＆＃39;即整整一周。因此，只应删除前2个记录，并显示最后3个记录。

SELECT [Name]
  ,[Last_Working_Day]
  ,[Date_of_Return]
  ,[LeaveValue]
  ,NewWeekStatus
  FROM [Emp]
  INNER JOIN [Date]
  ON [Emp].Last_Working_Day = [Date].FullDate

  WHERE [Date].NewWeekStatus = 'Current Full Week'

我怎样才能做到这一点？

Answer 1

您需要先找出当前的第一天和最后一天，如下所示。

 Declare @StartWeek AS datetime, @EndWeek AS datetime
 select  @StartWeek=     DATEADD(week, DATEDIFF(day, 0, getdate())/7, 0)
 select   @EndWeek  = DATEADD(week, DATEDIFF(day, 0, getdate())/7, 6)

然后您可以在查询中使用这两个日期。

SELECT [Name]
  ,[Last_Working_Day]
  ,[Date_of_Return]
  ,[LeaveValue]
  ,NewWeekStatus
  FROM [Emp]
  INNER JOIN [Date]
  ON [Emp].Last_Working_Day = [Date].FullDate
  WHERE [Date].NewWeekStatus = 'Current Full Week'
  AND [Emp].Last_Working_Day BETWEEN @StartWeek  AND @EndWeek
  AND [Emp].Date_of_Return BETWEEN @StartWeek  AND @EndWeek

然而，你的欲望输出需要考虑上周而非本周。

Answer 2

看看这个：

SELECT [Name]
  ,[Last_Working_Day]
  ,[Date_of_Return]
  ,[LeaveValue]
  ,NewWeekStatus
  FROM [Emp]
  INNER JOIN [Date]
  ON [Emp].Last_Working_Day = [Date].FullDate
  WHERE [Date].NewWeekStatus = 'Current Full Week' and (Date_of_return>='2016-10-10' and Date_of_return<='2016-10-16')